Spondylolysis of the lumbar spine: demonstration of defects and laminal fragmentation.

1 December 1984

journal article
research article
Published by Radiological Society of North America (RSNA) in Radiology

Vol. 153 (3) , 627-629
https://doi.org/10.1148/radiology.153.3.6494460

Abstract

Fifty-six cases [human] of spondylolysis were encountered in 1500 lumbar spine reports [radiographs] reviewed. The frequency of detecting isthmus defects on anteroposterior (AP), lateral, 45.degree. right and left oblique, 30.degree. up-angled AP, and collimated lateral views was determined. The collimated lateral view showed the largest number of pars defects, 84% of cases. The 30.degree. up-angled AP view was more sensitive than the AP view, showing 55% vs. 32% of cases. A previously unreported sign of spondylolysis, fragmentation of lamina demonstrated on the AP or AP up-angled view, was found in 14.2% of cases of spondylolysis.

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